Ortel Communications — poor internet connection newmodem problem

I am Debabrata Sahoo, and my consumer number is 01927854. I installed a new net connection on 13th August, and since that day I have been unable to use the internet. the modem wont connect to a device two metres away and when I sit in the next room, it doesn't even show on avaliable networks. Ortel I s one of the worst companies when it comes to service provide and customer services. Kindly take this into account and help me Otherwise return my money and tke the modem back.